CVE-2020-3994

Name: CVE-2020-3994
Creator: NVD / NIST
Published: 2020-10-20T17:15:12.967+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 0.64%

Last modified Jun 17, 2026

CVE-2020-3994 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. VMware vCenter Server (6.7 before 6.7u3, 6.6 before 6.5u3k) contains a session hijack vulnerability in the vCenter Server Appliance Management Interface update function due to a lack of certificate validation. A malicious actor with network positioning between vCenter Server and an update repository may be able to perform a session hijack when the vCenter Server Appliance Management Interface is used to download vCenter updates.. EPSS estimates a 0.64% chance of exploitation in the next 30 days.

Description

VMware vCenter Server (6.7 before 6.7u3, 6.6 before 6.5u3k) contains a session hijack vulnerability in the vCenter Server Appliance Management Interface update function due to a lack of certificate validation. A malicious actor with network positioning between vCenter Server and an update repository may be able to perform a session hijack when the vCenter Server Appliance Management Interface is used to download vCenter updates.

Metrics

CVSS 3.1

7.4/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

0.64%

45.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Vmware	Cloud Foundation	>= 3.0, < 3.9
Vmware	Vcenter Server	6.5
Vmware	Vcenter Server	6.7

References

https://www.vmware.com/security/advisories/VMSA-2020-0023.htmlPatch, Vendor Advisory
https://www.vmware.com/security/advisories/VMSA-2020-0023.htmlPatch, Vendor Advisory

Timeline

Published: Oct 20, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-3994?

How severe is CVE-2020-3994?

CVE-2020-3994 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 0.64% probability of exploitation in the next 30 days.

How do I fix CVE-2020-3994?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-3994?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST